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They are asking the court to award them additional pay for hours they worked over 40 to bring that compensation to time and a half.

Without an accounting from Mission Support Alliance, the plaintiffs don’t know how much money they are owed, the lawsuit said.

In addition to asking for back pay, they are asking for damages equal to the back pay, interest and attorney fees.

Mission Support Alliance, owned by Leidos and Centerra Group, said in court documents the firefighters who have filed suit are salaried rather than hourly workers and are not owed overtime under the federal Fair Labor Standards Act.

They either perform executive or administrative work and also could qualify as exempt from the overtime law if they are paid more than $100,000 annually, according to Mission Support Alliance in court documents.

The firefighters filing suit were paid consistent with a union-negotiated collective bargaining agreement, the Department of Energy contractor said.

The firefighters’ union previously litigated a similar claim and lost, Mission Support Alliance said. But if there is a different outcome in this case, a two-year statute of limitations could apply, it said.

Mission Support Alliance is asking that the firefighters’ complaint be dismissed and that its attorney fees be paid by plaintiffs.